Battery
Team Owner
Joined: May 2000
Posts: 53,439
Likes: 5,558
From: Plantation Florida USAF(Retired) 1966-1990
U.S. Air Force
St. Jude Donor '05 thru '26
NCM Sinkhole Donor
Did he replace radio, if so might be starting point it was hooked up wrong. If that isn't case, what is new in the car that it didn't come with that he might of added, is a good start.
Thread Starter
6th Gear
Joined: Nov 2021
Posts: 6
Likes: 0
Sounds reasonable….the only thing mentioned was the hazard button sticks and alarms when turn signals are used. I just got the car a week ago and intended to have that fixed, now more than ever. Thanks for the thoughts
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,320
Likes: 3,927
From: Cape Coral, Florida
Your battery should NOT go dead in a week…a month yes a week no…you may have a parasitic drain…you will need your mechanic to diagnose this…the more your battery discharges it will not last very long and you will need to replace it again !!
Last edited by C5 Diag; Nov 28, 2021 at 07:14 PM.
Thread Starter
6th Gear
Joined: Nov 2021
Posts: 6
Likes: 0
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,320
Likes: 3,927
From: Cape Coral, Florida
Administrator
Joined: Mar 2001
Posts: 367,305
Likes: 24,575
From: In a parallel universe. Currently own 2014 Stingray Coupe.
C7 of the Year - Modified Finalist 2021
MO Events Coordinator
St. Jude Co-Organizer
St. Jude Donor '03 thru '25
NCM Sinkhole Donor
CI 5, 8 & 11 Veteran
Not a bad idea to keep the car on a battery tender when not being driven, but as others have said, the battery, under normal conditions, should not go dead in a week. Something needs checking to see why the battery goes dead in such a short period of time.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Team Owner
Joined: Sep 2002
Posts: 29,888
Likes: 4,538
From: Bonita Springs, Florida
There may be an excessive drain or maybe the battery is not being fully charged.
Just something to consider when you eventually replace the battery.
Le Mans Master
Joined: Feb 2003
Posts: 6,682
Likes: 144
From: Memphis Tennessee
I totally agree with the "hive" here on your issue.
Things to remember include the fact that there is significant parasitic draw on C5's. Several things are "awake" even though the car is not on or being driven. I too recommend a trickle-charger when not using your ride more than a few days. In fact, I was able to nurse the OEM battery just short of 10 years due to the usage of a quality trickle-charger.
Also to remember, when the battery voltage does get low, our C5's do the very strangest things. Don't ask me how I know, but please take into account.
Good luck and enjoy.
Things to remember include the fact that there is significant parasitic draw on C5's. Several things are "awake" even though the car is not on or being driven. I too recommend a trickle-charger when not using your ride more than a few days. In fact, I was able to nurse the OEM battery just short of 10 years due to the usage of a quality trickle-charger.
Also to remember, when the battery voltage does get low, our C5's do the very strangest things. Don't ask me how I know, but please take into account.
Good luck and enjoy.
Melting Slicks
Joined: Apr 2021
Posts: 2,188
Likes: 82
How old is your battery? I had a 1 and half year old battery that would go dead in a week as well from the previous owner if not started every few days that was out a warranty by half a year. Replaced it with a 1 year warranty VP-78 from walmart for around 50$. My volt gauge reads 13.1 and 13.4 at times but under the engine fuse box the fuses would read 13.7 and 14.2 with the car running.
Melting Slicks
Joined: Sep 2008
Posts: 3,117
Likes: 793
From: Espanola New Mexico
There are two things you have to do, connect a DMM configured as a ammeter in series between negative battery terminal and negative battery cable and select 10A scale to measure current after twenty minutes with the car off. Normal sleep mode current us 25ma, if you do have excessive current draw you will have to measure voltage across the fuses, there is a video on how to do this.
Le Mans Master
Joined: Feb 2021
Posts: 6,405
Likes: 4,239
From: Florida
2025 Corvette of the Year Finalist - Unmodified
2024 C5 of the Year Winner- Unmodified
2022 C5 of the Year Finalist - Unmodified
There’s another possibility…. Is your charging system working properly? Could be either it is not driven long enough to fully charge, or just not charging as fast as it should.